Question

how many electrons are there in 10 gram water

Answer 1

no . of moles = given mass / molecular mass

so

moles = 10 / 18 × 6.22× 10^ 23


now , total number of electron in Water is

=> 8+ 2 = 10


hence total number of electron in 10 gram water is

=> 10× 10/ 18 × 6.22× 10^ 23


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Answer 2

$\huge\green{As-Salamu-Alykum}$

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$\huge\red{Given:- }$

Mass of water = 60g

$\huge\pink{Required:- }$

Electrons in 10g water = ?

$\huge\orange{Solution :- }$

Moles of water = mass / molar mass

Moles of water = 10 / 18

Moles of water = 0.55 moles

Now ..........

Moles of H2O = number of molecules of water / Avagadro number

Number of molecules of water = moles of H2O × Avagadro number

Number of molecules of water = 0.55 × 6.023 × 10^23

Number of molecules of H2O = 3.3 × 10^23

Now ........

We know that one molecule of water has :-

Two hydrogen atoms

One oxygen atom

Here ........

Hydrogen has 1 electron

So.....

2 hydrogen has two electrons

AND ..........

Oxygen has 8 electrons

$\huge\blue{Electrons in one molecule of water }$


So total electron in one molecule of water are $\huge\red{10}$

NOW............

Number of electrons in 3.3×10^23 molecules of water are :-

3.3×10^23 × 10 (10 being number of electrons in one molecule of water )

= 33×10^23

$\huge\blue{Number of electrons in 10 g water are 33×10^23}$


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$\huge\pink{INSHALLAH it will help U}$